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   Revision of limit value for longitudinal forces in the train  evaluated  
Safety requires a limitation of the permissible longitudinal force exerted on the locomotive by the following cars. For some loco-hauled trains, this is a critical restriction for the use of regenerative braking. A more differentiated concept for the limit values for longitudinal forces could remove this barrier.
Technology field: Regenerative braking and energy management
open main section General information
close main section General criteria
  close sub-section Status of development: in use
    Used in Switzerland.
  Time horizon for broad application: in < 2 years
    (no details available)
  Expected technological development: not applicable
    Concept is not technological.
    Motivation:
    Energy saving through increased recuperation
  Benefits (other than environmental): small
    Less wear of brakes through increased use of regenerative braking.
  Barriers: medium
   

Safety

The limitation of longitudinal forces is relevant for derailment prevention and therefore very safety critical. A modification of the regulations would require extensive safety audits.
    Success factors:
    (no details available)
  Applicability for railway segments: high
    Type of traction:  electric - DC, electric - AC
    Type of transportation:  passenger - main lines, passenger - high speed, passenger - regional lines, passenger - suburban lines, freight
    Modified limit values for permissible longitudinal forces in the train would obviously affect all trains but the changes would be relevant only for loco-hauled stock since MUs have driven axles along the entire train. From the point of view of energy efficiency, the measure is only interesting for electric stock.
    Grade of diffusion into railway markets:
  Diffusion into relevant segment of fleet: not applicable
  Share of newly purchased stock: not applicable
    (no details available)
  Market potential (railways): not applicable
    (no details available)
    Example:
   

SBB

Swiss SBB have introduced a differentiated concept for the limitation of longitudinal forces. Whereas most railways use 150 kN for all trains, SBB have increased the permissible forces to 240 kN for most trains with some restrictions (to 150 kN) for some freight trains.
open main section Environmental criteria
open main section Economic criteria
no data available Application outside railway sector (this technology is railway specific)
open main section Overall rating
References / Links:
Attachments:
Related projects:
Contact persons:
 date created: 2002-10-09
 
 
© UIC - International Union of Railways 2003
 
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